Rabbi Shmuel Duvid Halberstam

Rabbi Shmuel Dovid Halberstam, (Hebrew: שמואל דוד הלברשטאם‎), also known as the Sanz-Klausenberger Rebbe of Borough Park, is the younger son and one of the successors of Rabbi Yekusiel Yehudah Halberstam, the previous Klausenberger Rebbe. He resides in Brooklyn, New York.

Rabbi Halberstam is the leader of North American operations for the Mifal HaShas Torah study network founded by his father, and honoree president of the Kolel Chibas Yerushalayim charity organization in the name of Reb Meir Baal HaNess.

He married Tzipora Weider, daughter of Rabbi Aharon Wieder, the Linzer Rav, who was a long-time dayan in the Klausenberger beis din (rabbinical court) in America.

The Rebbe is known of his effusive and lengthy prayers